## Reflection: High Quality Task SUB! How can we use the properties of algebra to figure out the intersection of two lines WITHOUT graphing? (Day 3 of 3) - Section 2: Play of the Day

On the GOLD problem in this lesson, I wanted to assess student mastery across several standards, and so I introduced a real-life application of a systems problem (early in the unit, a benefit of leading with real-life applications rather than waiting until the end) but introduced the idea of unit conversion, emphasizing the idea that units must be the same for a system to be solved algebraically.

See the two different student work samples in the resource section.

# SUB! How can we use the properties of algebra to figure out the intersection of two lines WITHOUT graphing? (Day 3 of 3)

Unit 5: SYSTEMS OF LINEAR EQUATIONS
Lesson 5 of 19

## Big Idea: More substitution! Get kids to isolate a variable BEFORE solving. Getting trickier...

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75 minutes

### Jeff Li MTP

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